US20040014326A1 - Bi-layer resist process - Google Patents
Bi-layer resist process Download PDFInfo
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- US20040014326A1 US20040014326A1 US10/196,291 US19629102A US2004014326A1 US 20040014326 A1 US20040014326 A1 US 20040014326A1 US 19629102 A US19629102 A US 19629102A US 2004014326 A1 US2004014326 A1 US 2004014326A1
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- 238000000034 method Methods 0.000 title claims abstract description 52
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 28
- 239000010703 silicon Substances 0.000 claims abstract description 28
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052814 silicon oxide Inorganic materials 0.000 claims abstract description 26
- 239000000758 substrate Substances 0.000 claims abstract description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 25
- 229910052760 oxygen Inorganic materials 0.000 claims description 25
- 239000001301 oxygen Substances 0.000 claims description 25
- 239000003990 capacitor Substances 0.000 claims description 15
- 238000005530 etching Methods 0.000 claims description 14
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 12
- 229910052731 fluorine Inorganic materials 0.000 claims description 12
- 239000011737 fluorine Substances 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 10
- 230000004888 barrier function Effects 0.000 claims description 8
- 229910019897 RuOx Inorganic materials 0.000 claims description 4
- 229910052741 iridium Inorganic materials 0.000 claims description 4
- VRIVJOXICYMTAG-IYEMJOQQSA-L iron(ii) gluconate Chemical compound [Fe+2].OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O.OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O VRIVJOXICYMTAG-IYEMJOQQSA-L 0.000 claims description 4
- 229910052697 platinum Inorganic materials 0.000 claims description 4
- XPDWGBQVDMORPB-UHFFFAOYSA-N Fluoroform Chemical compound FC(F)F XPDWGBQVDMORPB-UHFFFAOYSA-N 0.000 claims description 3
- RWRIWBAIICGTTQ-UHFFFAOYSA-N difluoromethane Chemical compound FCF RWRIWBAIICGTTQ-UHFFFAOYSA-N 0.000 claims description 3
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims 4
- 238000000576 coating method Methods 0.000 claims 4
- 239000010410 layer Substances 0.000 description 105
- 239000004065 semiconductor Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
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- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
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- 238000001459 lithography Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
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- 238000006884 silylation reaction Methods 0.000 description 1
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- 238000002834 transmittance Methods 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/075—Silicon-containing compounds
- G03F7/0752—Silicon-containing compounds in non photosensitive layers or as additives, e.g. for dry lithography
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/094—Multilayer resist systems, e.g. planarising layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/033—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers
- H01L21/0332—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers characterised by their composition, e.g. multilayer masks, materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
- H01L21/3213—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer
- H01L21/32139—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer using masks
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
- H01L21/0273—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers characterised by the treatment of photoresist layers
- H01L21/0274—Photolithographic processes
Definitions
- the present invention relates in general to a method of manufacturing integrated circuits and other electronic devices.
- the present invention relates to an improved process for photoresist patterning in the manufacture of integrated circuits and other electronic devices.
- the bi-layer resist method an organic resin is coated to a film thickness of 1-2 ⁇ m, for example, to form a lower resist layer on which there is formed an upper resist layer of a thin film of about 0.1-0.2 ⁇ m, and then the upper resist layer is first patterned by light exposure and development of the upper layer and the resulting upper layer pattern is used as a mask for etching of the lower layer, to form a resist pattern with a high aspect ratio.
- the bi-layer resist method can alleviate or prevent the influence of level differences in the substrate and reflection from the substrate surface by the lower layer resist, while the small film thickness of the upper layer resist allows improved resolution compared to single-layer resist methods. Consequently, the bi-layer resist method is more advantageous than the single-layer resist method for formation of intricate patterns on substrates with large level differences and it is therefore believed to be a more effective resist process for the shorter wavelengths of exposure light sources which will be used in the future.
- An object of the present invention is to provide a bi-layer resist process to prevent the two resist layers from intermixing.
- Another object of the present invention is to provide a bi-layer resist process, wherein the resist layer can withstand high physical bombardment during etching.
- a new bi-layer resist process for semiconductor processing is achieved.
- a layer to be etched is provided on a substrate.
- the layer to be etched is coated with a bottom silicon-containing resist layer.
- the bottom silicon-containing resist layer is baked.
- the bottom silicon-containing resist layer is treated to form a silicon oxide layer on a surface of the bottom silicon-containing resist layer.
- the silicon oxide layer is coated with a top resist layer.
- the top resist layer is baked.
- the top resist layer is exposed to light and developed to form a pattern in the top resist layer. The pattern is transferred through the silicon oxide layer to the bottom resist layer.
- FIGS. 1 A- 1 F depict a bi-layer resist process for semiconductor processing according to the embodiment of the present invention.
- FIG. 2 depicts the capacitor process applying the bi-layer resist process.
- FIG. 3 depicts the FeRAM process applying the bi-layer resist process.
- FIGS. 1 A- 1 F depict a bi-layer resist process for semiconductor processing according to the embodiment of the present invention.
- a layer 102 to be etched is provided on a substrate 100 .
- the substrate 100 includes semiconductor elements, such as transistors, formed therein, which are not shown in figures.
- a bottom silicon-containing resist layer 104 is coated on the layer 102 to be etched.
- the thickness of the bottom silicon-containing resist layer 104 is about 5000-15000 ⁇ .
- the bottom silicon-containing resist layer 104 is subjected to hard bake, and the temperature used to bake is about 120180° C.
- the bottom silicon-containing resist layer 104 is treated to form a silicon oxide layer 106 on a surface of the bottom silicon-containing resist layer 104 .
- the treating method subjects the bottom silicon-containing resist layer 104 to an oxygen-containing plasma 108 .
- the gas used in the oxygen-containing plasma can be SO 2 , N 2 O or CO.
- the plasma is used at a pressure of about 30-50 mtorr.
- a thin top resist layer 110 is coated on the silicon oxide layer 106 .
- the thickness of the thin top resist layer 110 is 2000-5000 ⁇ .
- the top resist layer 110 has the benefit of high resolution and DUV or EUV light is used as exposure light source.
- the top resist layer 110 is then subjected to soft bake.
- the baked, top resist layer 110 is exposed to light and developed to developer to form a pattern in the top resist layer 110 a.
- the pattern in the top resist layer 110 a is then transferred through the silicon oxide layer 106 to the bottom resist layer 104 , as shown in FIGS. 1E and 1F.
- the silicon oxide layer 106 is etched using a fluorine and oxygen-containing plasma and transformed into the patterned silicon oxide layer 106 a .
- the fluorine-containing gas used in the fluorine and oxygen-containing plasma can be CF 4 , CHF 3 or CH 2 F 2 and the oxygen-containing gas used in the fluorine and oxygen-containing plasma can be SO 2 , N 2 O or CO.
- the bottom resist layer 104 may be lost in the first plasma etching step, and become the partially etched bottom resist layer 104 a as shown in FIG. 1E.
- the bottom resist layer 104 a is etched through using an oxygen-containing plasma and transformed into the patterned bottom resist layer 104 b .
- the oxygen-containing gas used in the oxygen-containing plasma can be SO 2 , N 2 O or CO.
- the top resist layer 110 a may be lost.
- the silicon oxide layer 106 a on the surface of the bottom resist layer 104 b can withstand the resist etching.
- the silicon oxide layer 106 a and the bottom resist layer 104 b function as etch masks.
- the silicon oxide layer 106 a works like a hard mask and, therefore, the thickness of the bottom resist layer 104 b can be reduced without affecting the following etching.
- the above-mentioned bi-layer resist process can be applied to a capacitor processing, such as the FeRAM (Ferroelectric RAM) process.
- a capacitor processing such as the FeRAM (Ferroelectric RAM) process.
- the layer 102 to be etched is a stacked layer comprising a top electrode layer 102 e , an insulating layer 102 c (such as an insulating ferroelectric layer) and a bottom electrode layer 102 a to form a capacitor.
- the capacitor when the bi-layer resist process is applied in the FeRAM process, the capacitor is a FePAM capacitor, the stacked layer further comprises an upper barrier layer 102 d between the top electrode layer 102 e and the insulating layer 102 c , and a lower barrier layer 102 b between the bottom electrode layer 102 a and the insulating layer 102 c .
- the top electrode layer can be Pt, Ir, IrO x , SrRuO x , RuO x or LaNiO x
- the insulating layer can be PZT (PbZrTiO x ) or SBT (SrBiTaO x )
- the bottom electrode layer can be Pt, Ir, IrO x , SrRuO x , RuO x or LaNiO x
- the upper barrier layer 102 d and the lower barrier layer 102 b can be Ti/TiN stacked layer.
- etching the ferroelectric capacitor is the most critical process.
- the stacked capacitor film contains novel metal and ferroelectric insulator, so the etching selectivity of this kind of material versus resist is low.
- thicker resist layer is needed.
- thicker resist layer will not only create serious veil or fence problems, but also poor resolution.
- the silicon oxide layer covers the bottom resist layer as a hard mask, therefore etching selectivity can be improved.
- the silicon oxide layer can withstand the capacitor etching, so the thickness of the bottom resist layer can be reduced and the veil or fence problem can be reduced.
Abstract
A bi-layer resist process. A layer to be etched is provided on a substrate. The layer to be etched is coated with a bottom silicon-containing resist layer. The bottom silicon-containing resist layer is baked. The bottom silicon-containing resist layer is treated to form a silicon oxide layer on a surface of the bottom silicon-containing resist layer. The silicon oxide layer is coated with a top resist layer. The top resist layer is baked. The top resist layer is exposed to light and developed to form a pattern in the top resist layer. The pattern is transferred through the silicon oxide layer to the bottom resist layer.
Description
- 1. Field of the Invention
- The present invention relates in general to a method of manufacturing integrated circuits and other electronic devices. In particular, the present invention relates to an improved process for photoresist patterning in the manufacture of integrated circuits and other electronic devices.
- 2. Description of the Related Art
- With the trend toward higher integration and higher functionality of electronic devices, such as semiconductor devices, in recent years, progress continues to be made toward more intricate and multilayered wirings. In the manufacture of second generation semiconductor devices with ever higher integration and higher functionality, research has begun on using ArF excimer lasers and DUV even EUV light as exposure light sources in lithography techniques for intricate working, and progress is being made toward shorter wavelength applications. Problems raised with shorter wavelength light sources include the transmittance of the resist materials and reflection from the substrates, but surface imaging has been proposed as an effective technique to counter these problems, and a particularly effective method is the bi-layer resist method.
- According to the bi-layer resist method, an organic resin is coated to a film thickness of 1-2 μm, for example, to form a lower resist layer on which there is formed an upper resist layer of a thin film of about 0.1-0.2 μm, and then the upper resist layer is first patterned by light exposure and development of the upper layer and the resulting upper layer pattern is used as a mask for etching of the lower layer, to form a resist pattern with a high aspect ratio. The bi-layer resist method can alleviate or prevent the influence of level differences in the substrate and reflection from the substrate surface by the lower layer resist, while the small film thickness of the upper layer resist allows improved resolution compared to single-layer resist methods. Consequently, the bi-layer resist method is more advantageous than the single-layer resist method for formation of intricate patterns on substrates with large level differences and it is therefore believed to be a more effective resist process for the shorter wavelengths of exposure light sources which will be used in the future.
- U.S. Pat. No. 6,255,022 to Young et al. teach a bi-layer resist with bottom layer for planarizing and top layer containing silicon. However, a disadvantage is possible intermixing of these two resist layers. Also, as soon as the top layer is etched away, the bottom layer cannot bear high physical bombardment during etching, especially for noble metals used in FeRAM.
- U.S. Pat. No. 5,922,516 to Yu et al. teach a bi-layer resist with bottom layer for planarizing and top layer subjecting to silylation. However, this method also has the disadvantages mentioned above.
- An object of the present invention is to provide a bi-layer resist process to prevent the two resist layers from intermixing.
- Another object of the present invention is to provide a bi-layer resist process, wherein the resist layer can withstand high physical bombardment during etching.
- In accordance with the objects of this invention a new bi-layer resist process for semiconductor processing is achieved. A layer to be etched is provided on a substrate. The layer to be etched is coated with a bottom silicon-containing resist layer. The bottom silicon-containing resist layer is baked. The bottom silicon-containing resist layer is treated to form a silicon oxide layer on a surface of the bottom silicon-containing resist layer. The silicon oxide layer is coated with a top resist layer. The top resist layer is baked. The top resist layer is exposed to light and developed to form a pattern in the top resist layer. The pattern is transferred through the silicon oxide layer to the bottom resist layer.
- The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings, given by way of illustration only and thus not intended to be limitative of the present invention.
- FIGS.1A-1F depict a bi-layer resist process for semiconductor processing according to the embodiment of the present invention.
- FIG. 2 depicts the capacitor process applying the bi-layer resist process.
- FIG. 3 depicts the FeRAM process applying the bi-layer resist process.
- FIGS.1A-1F depict a bi-layer resist process for semiconductor processing according to the embodiment of the present invention.
- Referring to FIG. 1A, a
layer 102 to be etched is provided on asubstrate 100. Thesubstrate 100 includes semiconductor elements, such as transistors, formed therein, which are not shown in figures. A bottom silicon-containingresist layer 104 is coated on thelayer 102 to be etched. The thickness of the bottom silicon-containingresist layer 104 is about 5000-15000 Å. The bottom silicon-containingresist layer 104 is subjected to hard bake, and the temperature used to bake is about 120180° C. - Referring to FIG. 1B, the bottom silicon-containing
resist layer 104 is treated to form asilicon oxide layer 106 on a surface of the bottom silicon-containingresist layer 104. The treating method subjects the bottom silicon-containingresist layer 104 to an oxygen-containingplasma 108. The gas used in the oxygen-containing plasma can be SO2, N2O or CO. The plasma is used at a pressure of about 30-50 mtorr. - Referring to FIG. 1C, a thin
top resist layer 110 is coated on thesilicon oxide layer 106. The thickness of the thintop resist layer 110 is 2000-5000 Å. Thetop resist layer 110 has the benefit of high resolution and DUV or EUV light is used as exposure light source. Thetop resist layer 110 is then subjected to soft bake. - Referring to FIG. 1D, the baked,
top resist layer 110 is exposed to light and developed to developer to form a pattern in thetop resist layer 110 a. - The pattern in the
top resist layer 110 a is then transferred through thesilicon oxide layer 106 to thebottom resist layer 104, as shown in FIGS. 1E and 1F. - As shown in FIG. 1E, the
silicon oxide layer 106 is etched using a fluorine and oxygen-containing plasma and transformed into the patternedsilicon oxide layer 106 a. The fluorine-containing gas used in the fluorine and oxygen-containing plasma can be CF4, CHF3 or CH2F2 and the oxygen-containing gas used in the fluorine and oxygen-containing plasma can be SO2, N2O or CO. Thebottom resist layer 104 may be lost in the first plasma etching step, and become the partially etchedbottom resist layer 104 a as shown in FIG. 1E. - As shown in FIG. 1F, the bottom resist
layer 104 a is etched through using an oxygen-containing plasma and transformed into the patterned bottom resistlayer 104 b. The oxygen-containing gas used in the oxygen-containing plasma can be SO2, N2O or CO. - In the bottom resist etching through step, the top resist
layer 110 a may be lost. Thesilicon oxide layer 106 a on the surface of the bottom resistlayer 104 b can withstand the resist etching. - When the pattern continues transference to the
layer 102 by dry etching, thesilicon oxide layer 106 a and the bottom resistlayer 104 b function as etch masks. Thesilicon oxide layer 106 a works like a hard mask and, therefore, the thickness of the bottom resistlayer 104 b can be reduced without affecting the following etching. - The above-mentioned bi-layer resist process can be applied to a capacitor processing, such as the FeRAM (Ferroelectric RAM) process.
- As shown in FIG. 2, when the bi-layer resist process is applied to the capacitor process, the
layer 102 to be etched is a stacked layer comprising atop electrode layer 102 e, an insulatinglayer 102 c (such as an insulating ferroelectric layer) and abottom electrode layer 102 a to form a capacitor. - As shown in FIG. 3, when the bi-layer resist process is applied in the FeRAM process, the capacitor is a FePAM capacitor, the stacked layer further comprises an
upper barrier layer 102 d between thetop electrode layer 102 e and the insulatinglayer 102 c, and alower barrier layer 102 b between thebottom electrode layer 102 a and the insulatinglayer 102 c. The top electrode layer can be Pt, Ir, IrOx, SrRuOx, RuOx or LaNiOx, the insulating layer can be PZT (PbZrTiOx) or SBT (SrBiTaOx), and the bottom electrode layer can be Pt, Ir, IrOx, SrRuOx, RuOx or LaNiOx. Theupper barrier layer 102 d and thelower barrier layer 102 b can be Ti/TiN stacked layer. - For FeRAM fabrication, etching the ferroelectric capacitor is the most critical process. The stacked capacitor film contains novel metal and ferroelectric insulator, so the etching selectivity of this kind of material versus resist is low. Traditionally, thicker resist layer is needed. However, thicker resist layer will not only create serious veil or fence problems, but also poor resolution. In the present invention, the silicon oxide layer covers the bottom resist layer as a hard mask, therefore etching selectivity can be improved. The silicon oxide layer can withstand the capacitor etching, so the thickness of the bottom resist layer can be reduced and the veil or fence problem can be reduced.
- The foregoing description of the preferred embodiments of this invention has been presented for purposes of illustration and description. Obvious modifications or variations are possible in light of the above teaching. The embodiments were chosen and described to provide the best illustration of the principles of this invention and its practical application to thereby enable those skilled in the art to utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated. All such modifications and variations are within the scope of the present invention as determined by the appended claims when interpreted in accordance with the breadth to which they are fairly, legally, and equitably entitled.
Claims (21)
1. A bi-layer resist process, comprising:
providing a layer to be etched on a substrate;
coating a bottom silicon-containing resist layer on the layer to be etched;
baking the bottom silicon-containing resist layer;
treating the bottom silicon-containing resist layer to form a silicon oxide layer on a surface of the bottom silicon-containing resist layer;
coating a top resist layer on the silicon oxide layer;
baking the top resist layer;
exposing the top resist layer to light and developing the exposed resist layer of form a pattern in the top resist layer; and
transferring the pattern through the silicon oxide layer to the bottom resist layer.
2. The bi-layer resist process as claimed in claim 1 , wherein the temperature used to bake the bottom silicon-containing resist layer is 120-180° C.
3. The bi-layer resist process as claimed in claim 1 , wherein the thickness of the bottom silicon-containing resist layer is 5000-15000 Å.
4 The bi-layer resist process as claimed in claim 1 , wherein the step of forming the silicon oxide layer comprises subjecting the bottom silicon-containing resist layer to an oxygen-containing plasma.
5. The bi-layer resist process as claimed in claim 4 , wherein the gas used in the oxygen-containing plasma is SO2, N2O or CO.
6. The bi-layer resist process as claimed in claim 4 , wherein the plasma is used at a pressure of about 30-50 mtorr.
7. The bi-layer resist process as claimed in claim 1 , wherein the step of transferring the pattern through the silicon oxide layer to the bottom resist layer comprises:
etching the silicon oxide layer using a fluorine and oxygen-containing plasma; and
etching the bottom resist layer using an oxygen-containing plasma.
8. The bi-layer resist process as claimed in claim 7 , wherein the fluorine-containing gas used in the fluorine and oxygen-containing plasma is CF4, CHF3 or CH2F2.
9. The bi-layer resist process as claimed in claim 7 , wherein the oxygen-containing gas used in the fluorine and oxygen-containing plasma or the oxygen-containing plasma is SO2, N2O or CO.
10. The bi-layer resist process as claimed in claim 1 , wherein the layer to be etched is a stacked layer comprising a top electrode layer, an insulating layer and a bottom electrode layer to form a capacitor.
11. The bi-layer resist process as claimed in claim 10 , wherein the capacitor is a FeRAM capacitor, the stacked layer further comprises an upper barrier layer between the top electrode layer and the insulating layer, and a lower barrier layer between the bottom electrode layer and the insulating layer.
12. The bi-layer resist process as claimed in claim 11 , wherein the top electrode layer is Pt, Ir, IrOx, SrRuOx, RuOx or LaNiOx, the insulating layer is PZT (PbZrTiOx) or SBT (SrBiTaOx), and the bottom electrode layer is Pt, Ir, IrOx, SrRuOx, RuOx or LaNiOx.
13. A bi-layer resist process, comprising:
providing a layer to be etched on a substrate;
coating a bottom silicon-containing resist layer on the layer to be etched;
baking the bottom silicon-containing resist layer;
treating the bottom silicon-containing resist layer with an oxygen-containing plasma to form a silicon oxide layer on a surface of the bottom silicon-containing resist layer;
coating a thin top resist layer on the silicon oxide layer;
baking the top resist layer;
exposing the top resist layer to light and developing the exposed resist layer to form a pattern in the top resist layer; and
etching through the silicon oxide layer using a fluorine and oxygen-containing plasma to transfer the pattern to the silicon oxide layer; and
etching through the bottom resist layer using an oxygen-containing plasma to transfer the pattern to the bottom resist layer and removing the top resist layer.
14. The bi-layer resist process as claimed in claim 13 , wherein the temperature used to bake the bottom silicon-containing resist layer is 120-180° C.
15. The bi-layer resist process as claimed in claim 13 , wherein the thickness of the bottom silicon-containing resist layer is 5000-15000 Å.
16. The bi-layer resist process as claimed in claim 13 , wherein the gas used in the oxygen-containing plasma is SO2, N2O or CO and the plasma is used at a pressure of about 30-50 mtorr.
17. The bi-layer resist process as claimed in claim 13 , wherein the fluorine-containing gas used in the fluorine and oxygen-containing plasma is CF4, CHF3 or CH2F2.
18. The bi-layer resist process as claimed in claim 13 , wherein the oxygen-containing gas used in the fluorine and oxygen-containing plasma or the oxygen-containing plasma is SO21 N2O or CO.
19. The bi-layer resist process as claimed in claim 13 , wherein the thickness of the top resist layer is 2000-5000 Å.
20. The bi-layer resist process as claimed in claim 13 , wherein the layer to be etched is a stacked layer comprising a top electrode layer, an insulating layer and a bottom electrode layer using to form a capacitor.
21. The bi-layer resist process as claimed in claim 20 , wherein the capacitor is a FeRAM capacitor, the stacked layer further comprises an upper barrier layer between the top electrode layer and the insulating layer, and a lower barrier layer between the bottom electrode layer and the insulating layer.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US10/196,291 US6743734B2 (en) | 2002-07-17 | 2002-07-17 | Bi-layer resist process |
TW092104996A TW582058B (en) | 2002-07-17 | 2003-03-07 | Bi-layer resist process |
CN03107271.2A CN1210762C (en) | 2002-07-17 | 2003-03-19 | Making process of double-layered photoresist for semiconductor manufacture |
Applications Claiming Priority (1)
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US10/196,291 US6743734B2 (en) | 2002-07-17 | 2002-07-17 | Bi-layer resist process |
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US20040014326A1 true US20040014326A1 (en) | 2004-01-22 |
US6743734B2 US6743734B2 (en) | 2004-06-01 |
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US10/196,291 Expired - Lifetime US6743734B2 (en) | 2002-07-17 | 2002-07-17 | Bi-layer resist process |
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US (1) | US6743734B2 (en) |
CN (1) | CN1210762C (en) |
TW (1) | TW582058B (en) |
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US20060079894A1 (en) * | 2003-10-21 | 2006-04-13 | Innovative Spinal Technologies | Connector transfer tool for internal structure stabilization systems |
US20070288012A1 (en) * | 2006-04-21 | 2007-12-13 | Dennis Colleran | Dynamic motion spinal stabilization system and device |
US20080300638A1 (en) * | 2006-11-20 | 2008-12-04 | Depuy Spine, Inc. | Break-off screw extensions |
US7529708B2 (en) * | 2000-12-08 | 2009-05-05 | Xerox Corporation | System and method for determining latent demand for at least one of a plurality of commodities |
US20090143828A1 (en) * | 2007-10-04 | 2009-06-04 | Shawn Stad | Methods and Devices For Minimally Invasive Spinal Connection Element Delivery |
US20140035439A1 (en) * | 2012-08-03 | 2014-02-06 | Tdk Corporation | Piezoelectric device |
US9136820B2 (en) | 2012-07-31 | 2015-09-15 | Tdk Corporation | Piezoelectric device |
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US7529708B2 (en) * | 2000-12-08 | 2009-05-05 | Xerox Corporation | System and method for determining latent demand for at least one of a plurality of commodities |
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Also Published As
Publication number | Publication date |
---|---|
CN1210762C (en) | 2005-07-13 |
TW200402085A (en) | 2004-02-01 |
US6743734B2 (en) | 2004-06-01 |
TW582058B (en) | 2004-04-01 |
CN1469426A (en) | 2004-01-21 |
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